No it doesn't. It only provides that in PvE where you'd replace, say, an agility gem with a JC agility gem for some extra agility but in PvP you'll be spending a gem slot that could have PvP on an agility gem.

gem your main stat with the two jc only gems,even for pvp.for my warrior i use the +str cuts.also yes it does suck that blizz never put in res/pvp jc only gems for mop.it just shows us the lack of detail from blizz.